Pulley-block



? UNITED STATES PATENT OFFICE.

HENRY V. I-IARTZ, OF CLEVELAND, OHIO.

PU LLEY-BLOCK.

SPECIFICATION forming part of Letters Patent No. 527,425, dated October16, 1894.

Application filed February 12, 1894. Serial No. 499.915. (l lo model.) i

To all whom it may concern:

Be it known that I, HENRY V. HARTZ, a citizen of the United States,residing at Cleve land,in the county of Ouyahoga and State of Ohio, haveinvented certain new and useful Improvements in Pulley-Blocks; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same. 1

.My invention relates to improvements in pulley blocks, and theinvention consists in a pulley block constructed substantially as shownand described and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of myimproved block, with a part of the top broken away toward the center todisclose more clearly the construc tion and means of attaching thering... Fig. 2 is a vertical central sectional elevation on a linecorresponding to 2, 2, Fig. 1. Fig. 3is a or oil pocket.

cross section of the casing or shell of the pulley on line 3, 3, Fig. 1.Fig. 4 is a front elevation of a section of that part of the sheavewhich is shown below in Fig. 2, looking in from the right thereof, andwhich contains the grease Fig. 5 is a cross section Online 4, 4, Fig. 2,showing the grease pocket and its front closing plate in cross section.Fig. 6 is a detail in perspective of the front plate for the greasepocket in the bent form in which it is inserted before springing to itsseat. Fig. 7 is a detail of the shaft before upsetting.

A represents the casing, frame or shell of the pulley, which is cut andstamped out of a single piece of sheet steel or other suitable metal,fashioned in a die or dies to the form here shown, or to a substantiallysimilar or like suitable form. There are several features ofconstruction which are desirable in a shell or case of this kind to givestrength and serviceability, such as the outward flaring edges -2--along the sides of the shell and the slightly circular or convex top orback 3-- thereof. This top or back -3-, it will be observed, has adownward inclination at both sides, as seen in Fig. 1, and the flanges---2--=- along the edges run up to this bend and lose themselvestherein. The purpose of this bend or bow of the back is to contribute tothe strength of the center.

utilize as fully as possible all the metal in the sides and back for thepurposes of strength, and this effect is promoted by this constructionbecause it makes the sides and edgtis t' the casing were built with astraight flat top and excessive weight or pull were brought upon thesheave D, the tendency would be to throw the weight directly on thelines between the shaft E and the suspensory ring F, and there being noconnection between the sides2, 2, andring F but the back --3-, which isunsupported except at its center, these sides would not contributematerially to the supporting strength of the pulley; but by forming thetop of the casing or shell substantially as herein shown, or possibly alittle less or even a little more, the pull is distributed uniformlyacross the shell and the whole of each side is broughtinto action. Thisutilizes the bent edges 2 directly in the support of the weight andaltogether makes an exceedingly strong and durable shell. The shell isfurther strengthened by the struck up rib -6-, formed about shaft E andwith said shaft at its center.

The shaft E is constructed to form a hearing for the sheave D and tohave it turn thereon, but is fixed rigidly in the shell or frame A. Toeffect this result the eye of the shell at each side has a flat orstraight portion -7 and the ends of the shaft are cut away or scarfed tocorrespond to this construction of eye, and are provided with squareshoulders 8- to bear against the inside of the shell. In assembling theparts the shell is sprung over the ends of the shaft, and the said endsare then upset orriveted substantially as shown, and thus secure thesheave and shell permanently and firmly together. The shell is heldbetween shoulders 8- and head -l0 so that it cannot contracthor spread,and the sheave is made perfectly free to turn without danger of binding.

The ring F is formed as shown out of a single piece of metal bent to thedesired shape and has its two extremities flattened on the inside. Themetal driven from this point is forced back rather than in elongation ofthe part so that it widens the shank as com pared with the other part ofthe ring, as seen at -12-- in Fig. 1. There is nearly the same [NoModel.) W HILL 2 SheetsSheet 1. ELEVATOR APPARATUS.

ll! lIl lI lllll l)lllllllrulllllllllllllll Patented Oct. 16, 1894.

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Witnesses:

W A k Attorney.

